I think it depends on what you are after. I personally would just like to entertain and would probably get more from people enjoying my music than I would from money , but money doesn't motivate me in the slightest. That said I wouldn't turn it down because it would be nice not to have normal worries.
I think though if you are in it with CASH in mind then you probably won't have a very prolonged career cause you will be in it for all the wrong reasons and that will become apparent very quickly.
There's no time limit on good music or good entertainment.