hi, appraise please
What's the reg / renewal fee? The value depends a lot on these factors.
400$-500$ is the range of renewal/transfer it differs from a registrar to another in the range of 100$
lol .. I love the domain name .. short for "OK .. What The F___" .. really made me laugh
But the costs are no laughing matter. This is the type of domain you might actually luck out on with an end user (one of probably extremely few in .wtf .. even among single letters) .. but I think it's a longshot .. and personally I see the carrying costs as being too expensive to bother with given the risk/reward. Try to submit it at the namescon ROTD auction .. might be your best bet to get at least some of your costs back.
good luck with it!