Is NOT offering a free trial a bad idea for a new product?

Hi, I'm working on a project that will help users manage servers from remote. This service will use my servers, and for that, I will have to buy those servers up front. I first thought about offering a 15 days free trial, but I'm wondering if this is a great idea : I'm affraid that I will have too many curious users that will only try the app, and not go further the 15 days trial. This will led me to buy too many "unpaid" servers and may fail the whole project in term of cash. Don't get me wrong, I really would like to let people try before paying and I'm pretty sure this is a feature I will enable if/when the project is working and I can pay the servers without having money difficulties. But for starting, I'm wondering if not offering a free trial is a bad idea. In my opinion, forcing the user to pay to use at first day will bring only really interested users, but I may loose others that would first see, and then be interested to pay. I don't have much experience on that side, that's why I'm asking it to you. Thank you for your help :)