Bit more competition round my area than you might think. Some very talented guitarists working the club and restaurant scene.
And, let's be real... You do a grand job, but how many of the user demos here didn't make you cringe the minute they sang (often earlier!)? Whole LOT of people have higher opinions of their own playing than other might give them (were they not members on a forum together!). TBH, I know of more good singers that have regular jobs than I do of pros. Singing is the last refuge of 'natural talent' left in this technological age.
And, I'm sorry, but the miute you sit down at a keyboard and more than just a piano or Rhodes sound comes out, the minute you have bass and drums and some guitars going on, don't kid yourself. Your audience doesn't care SQUAT whether you use an arranger or an SMF. You are giving them far too much credit! All they know is they can SEE you aren't playing it all. They know karaoke when they see it....
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An arranger is just a tool. What matters is what you build with it..!