Multiple interviews...

Is it stupid of me to go to interviews not planning to take the job because I already took something else?

I also feel the next 2 interview sites are more complicated to get to and much harder work. They may offer me more but I am pretty set on this first easy one I got. Is it stupid of me to waste their time just to see if I would be qualified in their eyes and to know what I could be offered? I feel guilty.

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