also do these machines usually make good money or do they have to have 10,000$ in before they start holding?
Assuming that it's a Class III ("Vegas-style") machine with a random number generator, the result of every spin is random. That means that there could be a ton of losing spins in a row (causing a big "win" for the house), or there could be a ton of winning spins in a row (causing a big "loss" for the house). There is no magic dollar number that the machine needs to "take in" to affect its payout. As I mentioned in your Pot-O-Gold thread, your operation has to be ready to handle those inevitable swings in order to survive.
This isn't for Life of Luxury -- in fact it's for a three-reel traditional slot with a 92% payback (8% house hold), but the concept here remains the same whether it's a 5-reel video game or a 3-reel traditional slot:
Look at the "lower limit" and "upper limit" for that game. Those numbers are the likely range of payouts for the machine over "x" number of spins.
See how it isn't until 100,000 spins that the game even gets to a point where it's fairly certain to be making money for the house? At 10,000 plays it could potentially have only paid out 76.15% (great for you), OR it could potentially have paid out 109.26% (bad for you). If you keep the machine on your floor forever, it
will make money
in the long run, but anything can happen in the first few weeks, months, or years of operation of that machine. You could potentially have to pay out thousands of dollars the first month you have the machine. ...or at the same time, you could potentially make thousands of dollars in the first month you have the machine. The swings can be pretty extreme, and I'll emphasise it again, your business has to have the cash in the bank to survive those swings or you won't survive.
Casinos make their money by grinding away 1 to 15 percent (typically) of all of the cash that comes through the door
over the long term. Casinos have tons of machines and virtually unlimited bankrolls, so they're able to "weather the storm" as it were when they have losing days, weeks, or months (that is, days, weeks, or months when they pay out more than they take in).