what about switching to network licensing, then determine how many you actually need, and let the causal users fight over a few licenses? For example, at our office, we have 5 full time users of AutoCAD, we might be looking to hire someone part time, we have another user that rarely, if ever gets on AutoCAD, so instead of purchasing 2 full licenses at 7k* each, just get 1 network seat and let the two users split time on it. While keeping everyone else on standalone seats.
*using IDSP