To this business you need two things, always.
A credit card, and an automated marketing system.
A 'niche' is the only place you are going to consistently generate high profit on either eBay or uBid so go find that.
Its not the websites.
Its the products.
LOCATE the 'PRODUCTS' and line them with keywords, make sure its checked & won't get anyone in trouble either. Then sell it consistently, but swarm the traffic to you.
By consistent I mean, you throw out one & break even maybe a loss maybe not. Then, make certain your feedback increases. Then restock that product consistently, throw it out again and for as many times as you want. Generate profit.
Then go into the other niche, and FLOOD the traffic over to there. Then FLOOD the traffic until you've doubled the system on top of itself (Does this sound complex? Its not- you can funnel TRAFFIC to overlap itself until it just starts automatically coming by the thousands) and sell the products. Over and over.
CONSISTENCY is key. Use a credit card. Pay your 'payments' off later & gradually, let the system work itself until soon you won't really do much at all. You might just leave it on automatic with 10 products & the right marketing, 5 days later every one of them are sold out. And on your store you've sold another.
MOVING PEOPLE TO YOUR STORE=Key to the victory.