Same here. I actually renew many domains which don't come anywhere close to paying their keep (even ones with almost zero income or traffic) only because I hate to see them picked up on the drop, or worry about missing the value in the name (rarely valid) which someone else could then take advanage of.
Almost every name I let expure gets grabbed by someone, often a big player like NameAdmin or BuyDomains, etc. Odd thing is they are almost impossible to sell no matter how low they are priced yet someone will often buy it at auction for $60 or hundreds of $.
It is surprising why so many players mysteriously see value in our bad domains, which I do not understand. Anyone know why this happens so much?