what do you say to people who just come to sing and not buying anything
 

what do you do or say to people who just come to your show and all they wanted to do was to sing and not buying anything..

It's not my job to police what people are drinking or spending nor normally do I have the time to go & find out who is spending what. It's the bartenders/waitresses job IMO. I will let anyone sing if they are turning slips in. If the bar has a problem with it, they need to tell me that so & so can't sing because they haven't spent any money or flat out tell hem to spend or leave - that's their right.
But then on the flipside, sometimes these non-spending singers are generally pretty good & keep the crowd entertained to where they will want to stay to hear their next song as well so it's not always a bad thing in that respect.
Then you sometimes get the dedicated driver - however they COULD still spend money on something like RedBull, virgin drinks or buy food (if available).

i dont have the time too, the reason i asked was that the bar area where i do my show only has about 70 ppl seating capacity, not including the dining area and sometimes these people will occupy about 2 tables, and i have regulars that comes in after work which i know are big spenders that dont have anywhere to seat..but anyway just wondering what you guys think about it..

Personally what I THINK is they should be spending money in a bar - you don't necessarily have to drink alcohol, if you don't drink then soda, food, coffee other types of virgin drinks (unless it's a tavern). THEN the bar needs to CHARGE for EVERY drink coffee, soda, water included - no free refills (UNLESS they have been spending money all night & need to try to sober up a bit before driving out).
Again, you really can't say anything, you can suggest it to the manager/owner, & they can deal with the non-spenders accordingly.

Most bars I know will ask if they are drinking or eating if not they generally ask them to order something or leave, as it is not a rest stop. I do have some regulars that drink coffee, tea or water but tip for the service. That particular place seats 200 and is hardly ever at capacity. When I get singers that are in that group I generally play a few dj songs in between singers and they tend to start buying more to drink.

same here, me too.