Where the reselling margin comes from
Each client company is placed on one of the published HelloBooks plans, and your firm receives a firm discount on every one of those plans. You pay HelloBooks for the discounted plans plus a flat monthly license. What you charge the client is up to you, and the gap between the two is revenue that stays inside the practice every month.
Because HelloBooks bills only your firm, clients never receive a competing invoice for the same software. There is no awkward moment where a client compares your price against a vendor’s published rate on a card statement. The software shows up as part of your service, on your invoice, under your brand, which is how most clients prefer to buy it anyway.