Haha "I don't expect to make thousands of dollars...". That's funny.
10 USB Block Erupters have a hash rate of 3.36 GH/s. Assuming that the difficulty rises at a modest rate of about 22% per period (currently it is more than 30%),
your miners will mine a total of about 0.205 BTC, 0.195 BTC over the next 6 months.
At today's exchange rate, you will earn about $53.
But, let's look at it in terms of BTC. After all, instead of buy the mining gear to obtain bitcoins you could have just bought bitcoins directly. Assuming you bought the miners a week ago when the exchange rate was about $200/BTC, you could have bought 0.475 BTC instead.
Congratulations. You paid 0.475 BTC to mine 0.205 BTC.
My advice, use the block eruptors to have fun and learn.
Best advice ever
I'd really like to know how you got them numbers currently been mining 07:16 hours i've already earned 0.02128931 with my Block Erupters with Bitminter so thats about $6 of my investment back already.
I never expect to make alot i wanted to try the whole feel of bitcoin mining i myself will never use Bitcoins nor will i pay real money for them i find that to be as silly as spending money on video game currency.
May people will argue that bitcoins are the next best thing but like all good things must come to an end.
I think the thing that will be the fall of bitcoins and you can disagree with me all you want but the down fall of bitcoins will be the fact that it will be for only people who have the money to buy Bitcoins.
Myself i'll never buy bitcoins if they keep going up nor do i expect new people who are on a fixed income and a tight budget.
People claim bitcoins are a non controlled currency? Wrong! He has the money controls the bitcoins.
I would explain why but i'd rather you ask me how i figure that He who has the money controls the bitcoins.