assuming your 2.5k gives him a total of $15k to start....that's a decent startup for a small business sharing a space....however without some credit (probably like $10k, at least $5k) to fall back on he is going to need to use about 1/2 that as a reserve. You screw up property, you need to handle a refund, etc. Chances are at least one customer will scam him on a charge back or whatever as well.
When people plan a new business they have dreams of day 1 having a line of customers outside the door....and I can say unless you are a popular franchise, you may was well play the lottery with those odds and not even open
Then you run into days where 5 people come in at once and you have the first idiot talking and talking and talking. He is looking at a $50 product and having you show him the $500 one too, then something not even related. The other four people look better dressed and more capable of a purchase...however you don't know this guy, he may just have inherited $100MM or a successful but sloppy business man. You cut him off the other 4 are going to think you are rude to your clients.
However, one by one the other 4 customers leave the shop....this guy is continuing to talk and finally just as the last customer leaves, finally says 'well I guess it doesn't matter anyway, I need to find a job and a place to live first, but thanks for helping me...thanks for your time, I am going to go catch that free buffet down the street, have you been there yet?, it should be starting in a couple minutes'
Then low and behold one of the customers that left comes back in. He tells you he just bought a complete install down the street "yeah man, my $15k bonus dropped like it's hot!" but they were short an RCA cable and he needs one about 3'.....
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