It can be hard to bowl unopposed.  I have found the way to combat this, is to pitch in a pot where high man on the team gets the money.  Of course, you only bet maybe a buck or five at the most.  But, at least it keeps you pushing your teammates and keeps things fun and interesting.
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Steven Vance
Former Pro Shop Operator

If anyone out there is worried about the scores being too high, try duckpin!!

Run a team pot.

That's what we have done in the past.  We would throw in $5 bucks each and the winner for each game and total wood would each get $5. It gives the entire team an incentive to bowl better.  It'a amazing how hard people will play for $5 and bragging rights.
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The facts expressed here belong to everybody, the opinions to me. The distinction is yours to draw...

Enjoy,
Bob

Our league has a rule that any team that bowls a team that is forfeiting or a vacancy has to bowl within 10 pins per man of their average to win a game and within 30 pins per man to win total pins.  You'd be surprised how difficult that can be if even one bowler has a bad night.  --  JohnP

Two things I can think of from experience. 1) You can tire yourself out faster since the pace is quicker. 2) The fast pace doesn't allow the ball to dry as much since the time between shots is less. My ball, during practice for example, is usually saturated to the point a towel wont help it. During league, it's fairly dry shot to shot.

I would say, if it's a team pre/post bowl, pace it a little slower. Take breaks, etc.

However, there is the camp that would say that the faster pace can lead to higher scores overall. Maybe it's conditional. i.e., physical shape of bowler, conditions of oil, etc.
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Cobalt Bomb Solid
Cobalt Bomb Pearl
Tsunami H2O
F.O.S.