Take the money and play. Do the best you can for every song you record (regardless of your opinion of the music) and you will get a good reputation and people will start asking for you for their recordings.
If you start doing much of this, consider joining the musicians union. They get paid by the hour with a 3-hour minimum (3-hour session) and they get a royalty cut at the end of the year, which can add up quite nicely if you do much in the way of session work. The way that "royalty" works is that the record companies pay the Musician's union "X" amount of money for every release. At the end of the year you get a cut of that money depending upon how many union sessions you played.
If you start doing much of this, consider joining the musicians union. They get paid by the hour with a 3-hour minimum (3-hour session) and they get a royalty cut at the end of the year, which can add up quite nicely if you do much in the way of session work. The way that "royalty" works is that the record companies pay the Musician's union "X" amount of money for every release. At the end of the year you get a cut of that money depending upon how many union sessions you played.