Above ground or underground ? Straight through, or can it be routed so you could subdivide your land later ?
And, to clarify, they offered $30K TO you, not FROM you ?
And what are they feeding, a few homes, subdivision, farm, industrial...?

You might consider a monthly or yearly fee for compensation on top of an initial fee, for several reasons.
Not the least of which is to remain on the books and to address risk, usage, maintenance, and inflation.