The pro shop I go to is not located in an alley.  There are 4 alleys within 7 miles from it, however...
I am only recently starting to have some reservations about it because I am getting a little more serious about bowling.  I think my PAP has changed since the first ball that I have had drilled there and they are still using my original measurements.  I would like to have a pro shop in the alley I bowl my leagues in so that I could build a rep with my driller and he could suggest other drillings for me based on how I throw (all the stuff he has drilled for me is very close to label-leverage).  I threw him a curveball recently with a pin-in ball purchase and it has caused some problems: ball rolling over track, having the bring the ball in every week after league to have it adjusted until we get it to stop rolling over holes.  I think if he could have watched me throw the ball prior to drilling, we wouldn't have had this problem.  
On the other hand, there are some fantastic bowlers at my lanes that use the same pro-shop and they do a great job, so I don't know.
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If you can't DODGE it, RAM IT!!

I'd put a witty bowling slogan on here, but I'm not that good yet...

A few years ago Craig Hoyle had one about 6 or 7 blocks from what is now AMF Irving and it died.  That was then and there are a lot of differences now.  The first being the internet and not having to totally rely on the traffic a center brings to your door.  Look at some of the internet pro shops and notice where they are located.  Some are most likely nothing more than 2 guys with a couple of distributors catalogs and a phone.  No overhead other than the rent, a website and everything is ups'd out or drop shipped.  The second thing would be location.  From what i understand many states like Virginia it is hard to find a center with a pro shop.  Some centers do not want the headaches.  An example may be like a bowling/arcade/pool center.  The one big thing that would be lost is the place where most of the profit would be made.  People won't go to the mini strip mall for ez slide before league night.  Also testing ball fittings could be a hassle.

It could be done and probably better but the first few years would be really rough depending on where it was located and the time to shake the bugs out.

Smash49
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Smash49
robert@bowlersslidesock.com
Bowler's Slide Sock:  Reduces or eliminates problems with Slick OR Tacky approaches.
www.bowlersslidesock.com

While it would be possible to run a proshop outside a bowling center, it would be a tough way to get started.

Someone with an established reputation would probably do ok. But the extra traffic you get from just being in a center with their league bowlers means a lot in sales. Particularly for wrist braces, rosin, tape, etc.

The real problem comes down to doing a good job. It is often difficult to evaluate a new customer without actually seeing them roll the ball, see the oil lines for their track, get a feel for their approach, timing, etc.

The other problem is they don’t generally have a place to try a ball after drilling to see if it is worked out right. And it isn’t right to expect the bowling centers proshop to finish a ball up. The guy selling the ball made the money so they should do the work.

If they had a lane in the shop they could do this but I doubt if they do.

Serice, the drillers you mentioned is similiar to the example I just gave above. However, althought it never crossed my mind, Pinbuster also has some valid points. Especially when it comes to driving some where after drilling to try the ball and them find it needs some adjustment, so back to the Pro Shop, back to the lanes, and etc. I guess this thought never crossed my mind because when Steve drilled my balls, they were perfect and needed no adjustment.

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Lane 1 - The Bowlers Company

Nothing hits as hard as an Uranium