Is it even feasible to win in blackjack??

Hahaha, the BUD strategy was debunked a couple hundred years ago. It is true that betting strategy is the key to winning blackjack, but the method described above is useless. You should increase or decrease your bets in relation to the count of the deck. Also, using a simple counting strategy, it IS possible to count a multi-deck game. It is tougher, and the swings will be less severe, but it is indeed possible and profitable. You should pick up a book called _Blackjack for Blood_ by Bryce Carleson.