Of course most buyers that I encounter are not looking for pools and therefore see them as a hindrance in purchasing a home. There are however rare occasions where some buyers may even welcome a pool, but this is rare. The only time a pool can be used as a selling point is perhaps in luxury real estate, but for the most part I agree with you Fantastico, pools=lower prices or generally a tougher sale.
I have sold several homes with pools and the issue of the pool always comes up. I believe a fair valuation would be is the actual cost is in filling the pool and lanscaping the area Filling a typical pool will cost anywhere from $10,000-%15,000 to fill professionally. Simply landscaping a backyard will cost you roughly $2500 for sod, $1000 for sprinklers, $1000 for plants and trees, and $2000 for hardscaping. Total cost of lanscaping and filling the pool should be between $16,000 and $20,000.
Prices will vary by pool size and if you cannot get a bobcat or tractor to the back, so its wise to get an estimate from a professional pool demolition contractor. While preparing to put the home on the market, I will obtain an estimate for the removal and lanscaping, so if it becomes an issue, which it always has, we can present it to the buyer as an option.
I would not deduct it from the list price, but add it as an incentive if the buyer requests it.