I guess it's okay to reply to my own post - just to add to the discussion.
Back before I started to plug and drill my own stuff, this is how I looked at it:
Cost of ball new (if available).
Drilling costs - my local shops charge $60 for a new drill, $40 for complete plug and re-drill, and $20 for finger or thumb plug and re-drill. Add in an additional $15 for grips and slug.
At one point I didn't really care about layouts. I would just have the thumb plugged and re-drilled. I just wanted to try different balls and see if I could find something that I seemed to match up with (as if layout isn't a major factor there...doh!).
Let's just say that I've gone through a lot of balls - to the point that my local shops were giving me a hard time for drilling so many balls! No problem there, bought my own drilling equipment and have more money to spend on balls!
As far as a "standard rate," I guess I was thinking along the lines of say you immediately take off 50% because it is drilled. So, you could get a Twisted Fury for $150 from an on-line shop. Drilling/plugging should around the same, so that doesn't factor into the equation (unless you can get it from your local shop cheaper than on-line and paying drilling costs). Anyways, so a used TF would start at say $75. Some plug work, subtract out $x. Span is close, add $x. Layout is suitable, add $x. Ball is super popular, add $x. Stuff like that.
As far as shipping, I figure it's fair to add $5 to actual shipping costs to cover materials and paypal fees.
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