Well, the license doesn't cost much beyond the cost of the degree. A few hundred in fees, and possibly a, very optional, grand on courses for exam prep.
Most (? I assume?) software engineers have a degree anyway though, that's not an additional cost.
CEng is more of a burden of time and bothering with the admin than it is a financial cost, compared to the degree you already have anyway. (It used to be my plan, but nobody cares, so I stopped bothering to progress towards it. Regret it in a way, since I think it was a good personal goal even if nobody else cares.)
