Well I like to think of it like this. eBay is getting over 50,000 new signups a day. That's like 10-15 million a year.
We dont even have close to 50,000 active snipers and we've been around like a year and a half.
There are of course many more manual snipers. But even still perhaps 5% of eBay buyers snipe. You're still at a great advantage and with all the new buyers coming and signing up at eBay every day that's not too likely to change.