An appraiser for a lender for a subsequent buyer will not include the bond as part of the value, which would eliminate some buyers of that property where the bond has been paid and included in the sales price.
Example: Buyer can afford $60,000 as a down payment, and is looking for an 80% loan. He/she can buy a $300,000 house. If the seller paid off the bond, (assuming a $25,000 bond) the price would be closer to $325,000, which now requires $65,000 (80%) as a down payment, taking that buyer out of consideration for that home with the bond paid.
When you are trying to sell anything, you almost always want the biggest audience of potential buyers. The seller who paid off his/her bond has reduced the number of buyers who would be qualified to buy their home, therefore potentially reducing their sales price (not getting full value for their pre-paid bond).
This is my opinion.
EDIT: Ultimately, I agree with what dewilson58 says in the next post:
"I agree with other posts...........it's up to your personal financial position.
Are you going to stay in the home, or upgrade or die within 30 years??"