you're asking me to feel bad for a company that probably has millions in seed funding for investing a day in a new hire? hah, no, not going to happen. I (and probably most people here) already have a job that pays me for the work I do, this company can either do the same or they can walk. The one thing that's not going to happen is for me to pity them for the money they are investing.
No, I didn't ask you to feel bad for them. I only pointed out that there is at least some symmetry in the situation. I don't know where you got the very odd idea that pity is/should be involved.
There is no reason that you can't have a mature interaction with a company where you both agree to invest some time and effort in a process that could benefit both of you. If it looks like a bad risk to you, don't go. If you are doing a competent job of this, you should know what an interview process looks like before you agree to the interview. If there are aspect of it you aren't sure about, you should ask about them. If their reasoning doesn't convince you - respectfully decline the interview.
The most valuable thing about an interview process is an exchange of information. Thinking about it too much as a time-for-money trade off can miss this point. Of course, if you can find a more time efficient way to exchange the same information, that's good all around.
