They only have 1000miles surely they will last a lot more, no?
How do you think they're worth?
Those are 5600-series shifters. If they currently work and they really only have 100-miles on them (who can tell?) and they haven't been crashed, then they are definitely worth $100.
The one picture that is blurry is the key to the future durability. There were some early 5600-series shifters which were supposed to work with either triple or double gearing. They were usually used with doubles and very often would break if you tried to force a shift into the "missing" gear. This led to the production of 5601 and 5603 shifters, which are labeled "double" and "triple" respectively on the left shifter. Either way, it's a great set of shifters if you treat them right. I've seen some debate as to whether the new 5700-series is even an upgrade over 5600.
As mentioned above, you'd need to switch your chain and cassette over to 10-speed. You can get Tiagra cassettes pretty cheap and they'll work with those shifters.