Ask HN: Am I too demanding?

I want to ask HN about a thing that's bothering me now. I'm a web developer and I have recently changed job (3 months ago) because I had a few conflicts at my last company and was overall not satisfied with the company and the role I had in it. I managed to get a job in a nice startup working on some cool products and I learned tons of stuff since I came here 3 months ago. As an added bonus, I now work 4 days a week and I am overall extremely pleased with this new job.

I have two friends of mine who are still working for at my last company and are actively looking for jobs so I try to keep them motivated by sending them links to job posts that looks nice and encouraging them to find a job they like instead of enduring the one they have.

What I am starting to realize is sometimes I find job offers that I would like to apply for. I find this strange because I am really happy with my current job but I still find some other places could be an upgrade for me. The thing is, this is an endless circle! There will always be a nicer job than mine (the grass is always greener on the other side as they say!). I feel sometimes as I should send my resumes at a few places even though I love my current job, just to see if I could get a really great offer (in terms of salary and work conditions).

Am I being too demanding? Isn't this silly of me to think I should keep sending my resume after finding a nice job? Has anyone felt like this before?

Thanks!