I think you have a fairly good chance of breaking even. I bought my Homie 30cc weedwacker when Home Depot was clearancing them out a while ago for - guess what - $50. The dual-ring Homie 30cc is getting rarer and rarer to get and it's a better engine than the single-ring 25cc Homie. For this reason, there is certainly a demand for the 30cc, and DEMAND is what sells stuff.

That said, don't think you'll make out like a bandit with these thing though. The dual-ring Ryobi 31cc typically sells for about $50 as well. So you do have competition.

FWIW, I would buy a brand new 30cc Homie for $50 if I didn't have mine already.

Good luck.