I agree, I do this on a limited scale, but i't getting harder to make a profit.
First of all, conversion ratios are getting worser in generall,
second PPC SE's compete against each other to get more advertisers by getting more traffic.
But more traffic = less quality traffic.
Those who bid the top bids are often newbies, who deposit $50 into a PPC SE's, don't make any sale and leave, but new webmasters are coming and doing the same.
