It is absolutley not considered cheating, that is money management. Just know what the table maximums are. Also an inside hint to table minimums...as a typical weekend night progresses the casino get more crowed so the pit bosses raise the minimum bets. You will be hard pressed to find a $5 Black Jack table on a weekend night after 9.00. However, if you are at a table with $5 or $10 minimums and they raise the minimum to $20, they still honor the $5 minimum to players that were at the table for the $5 minimum. Call it a grandfather clause.
I have tried this doubling theory on blackjack and rollette with more positive results than negative. The secret is you need a bank roll to survive 7, 8, 9 losses in a row. It sounds impossible to lose that many times, but it can happen and happen quite easiily. Don't be greedy and have your first bet be $20, because you will quickly be at $160 and $320 bets before your first beer. Start small at $5 or $10 whatever the table minimum. If you are winning 3 out of 5 times every ten minutes you are on pace for $60 an hour in earnings.
My favorite is this but you will be on your feet and most likely not be able to enjoy the free adult beverages the cocktail waitresses hand out. You can get them, you just have to remember the waitress and look out for her when she returns. Also tip well, they frown on not delivering the drink to the same chair, they want you cemented in the chair because the odds go to their favor the longer you are in the chair. However I find the following scenario the most fun. You aren't bogged down at a BJ table with shuffling decks holding things up or stuck with a third baseman hitting on 14 when the dealer is showing a 6.
At the bigger casinos they will isolate games in sections, so 4 or 5 table of BJ and 3 or 4 tables of rollete. I like finding an intersection on the casino floor that has 3 or 4 tables of rollette WITH the digital recorder of the last 20 rolls within feet of each other. You jump from table to table playing the color. If the recorder shows 3 or 4 rolls of red, bet $10 on black. Lose bet $20, lose bet $40. Its the same idea you are trying, but jumping around let's you miss out on the first 3 or 4 losses in the streak. It is not uncommon for the same color to come up 10 times in a row.
Now the odds experts will say the ball, cards, dice don't have a memory. That is true, but for some reason I do well with this scenario. If you have a partner that wants to do this too, you can work together. If there are 2 tables going on a streak you can eye ball each other and place bets for each other. This last sentence is the only thing that might stretch the rules a little bit.
Good luck, have fun, and don't bet more than you can comfortably lose. Those are billion dollar hotels, so the odds are against us and they know what they are doing.
-Chris