I sold my equipment merely because of electricity
[snip]
Would you consider it to be more or equally profitable to spend say, 10-15k on BTC mining equipment like A6 avalons or S7's and with a completely proper setup..
it will again come down to electricity. if you have cheap electricity then you will make profit and if not you will have a hard time depending on how expensive your bill is going to be.
besides with the huge bitcoin difficulty that we have, it is hard to get a good profit. some say altcoins give you more bitcoin when you dump the mined coins than bitcoin itself does.