I did on line sales for over 4 years. Decided to stop in Jan this year. Hard to beat some of the "big boys" in thier prices. Not impossible but hard.
Drilling...that's a tough one. Some people are so picky about thumbs that you may well be sending the ball back 2 or 3 times, profits shot. One suggestion, shipping over seas is a tough one. To have a price where you can do good sales, you have to go standard/ship/freight. Takes time for that. Insure the balls ! Watch where you ship. I lost 4 balls to customers in Italy because they said they didn't want to pay the import duty. I got paid for them by insurance but it took over 6 months (usps).
I do wish you all the best, there's a market for everything, just have to find the right nitch.
Good Luck !
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net