The question is "Can you afford to play many numbers?"

You can play as many as you want to if you keep track of the balance point. In the long run you win or lose at keeping track of your wins verses your losses with relation to the ratio that balances the number of numbers you bet on, and in some cases the values they are bet at. You might bet double your base bet value on one dozen and and your base bet value on another dozen. That is a single spin balanced bet that will balance itself in two trials. When you use 9 numbers to bet on you get 4 chances to balance. When you bet 12 numbers you get 3 spins to balance. When you bet 18 numbers you get 2 spins to balance. One win and one loss equals zero earned. So you ask yourself how many losses can I take to balance one win. If you bet 3 numbers per bet, flat betting, then you get 12 losses for each win in order to balance.

Once you know your balance points you can devise a strategy that takes into account your effectiveness in the current session. Your actual bet selections can be blind guessing, educated guessing, rule based system selections, ESP, pet numbers, your horoscope picks, the guy next to you's win streak numbers, or a Kimo Li contraption selection. Whatever you chose you should deal with the results of your effectiveness. Or not, in which case you are playing for the house.

So my answer is yes if you keep track of the balance points and the effectiveness.

Thank you, thank you, I'll be here all week.