I have very interested to buy and install a couple of these machines around area where I am living.
But without a sustainable cash flow it's just an expensive machine with high cost of maintenance/high fees for end user.
Probably this is a market profitable only for big whale or company with tens of ATM in big cities.
Yep, BTC ATM business seems attractive at first, but when you put some numbers on the paper it is a bit more complicated.
Some time ago I was playing with the idea of buying one of those with few of my friends and installing it somewhere but after some napkin math we quickly changed our mind. Good machines with buy/sell options cost at least 10,000 USD, then you have to rent the space, register the business, pay the taxes etc and all this with not taking huge fees as you have to stay competitive with others in the business. It turns out that you need tens of thousands of dollars worth of transactions per month just to stay in black, let alone profit in order to get the investment back. Unless you own some good place where you can install it (some popular bar for example) you will have extremely tough time.
One thing to consider is the privacy of the installation itself, and the buy/sell process. I’ve got a BTC ATM not too far away, which it is located within a store. The ATM is seemingly small, and I figure that all the cash needs to go through the teller (*), which is fine for some people (as they will aid them in the process), but personally, I’d rather not have to let someone know what amounts I’d purchase, nor the frequency of my habits.
Well that sucks, that there is still someone near so it's not very anonymous , or at least not anonymous enough for some. The place I am using for last couple of years has 2 crypto ATMs in some small rented place ( one is for buying and selling few most popular altcoins like Dash, ETH, Monero and the other just for BTC) with only surveillance camera, so there is some sort of anonymity. They also don't ask for any kind of SMS verification as I've seen few of those that ask that and it sucks as you can be easily identified nowadays through your mobile number.
The only downside of all this is the fact that they take 5% fee, which is a lot imho, but I know that they don't make huge profit out of it considering the expenses.