Congrats! Can I suggest charging more?
IIUC, your business plan is $10/month for the company, regardless of number of users?
You probably save a company that $10 in a day or less for one GPU: One A100 is ~$3/hr on demand and ~$.90/hr as Preemptible, saving over $2/hr.
Said another way, your pitch is to recover a lot of the 70% discount that they aren't going to do themselves. If you were a managed training service, you could pitch yourself as "half the price of AWS or GCP" and keep the 20%+ margin with both parties being happy. (The problem is that pass through billing makes that obvious, you need to support lots of bucket security and IAM controls, etc.).
Fwiw, I would also branch out into inference! Preemptible and Spot T4s are commonly used for heavy image models, but many people pay full price. Inference that takes X ms can easily be handled "without errors" in the shutdown time. The risk is handling all the capacity swings.