Let me try to answer, in your above situation the seller has indeed been honest and stated the yearly renewal fees, you could, if the seller was willing to comply ask to see the conformation email they were sent when purchasing Bible.TV, this would let you see what price was paid,how long it is regged for and if they received any discount from
www.tv ( now enom).
When the registry was
www.tv they offered up to 70% discount on some premium regges, example- dog.tv $1000 per year you paid $300 after the 70% discount
Enom have since revamped the prices for example one of my regges was $1000 per year,i got 70% discount so i paid $300, i took this for 2 years,however enom have now put it at $500 per year reg fee,it may be worth asking him if the $2500 fee was the fee he paid per year,or if it is the fee that enom are now charging for the domain per year.
Once you are happy with what the yearly reg fee is,then it is entirely at your discretion whether you buy the domain or not, but at least you then have the facts to which to base your decision on.
Hope this helps, if i have missed anything or have got anything wrong i am sure one of the other members will advise you.
Good luck