I don't think that is entirely fair. I've seen Zeballos play at Roehampton, and he was very passionate to be there (even if he played really poorly). The main difference is that he has already played in the main draw in Wimbledon, so he no longer has to dream about playing there. Plus, he probably realises that he has never done well on the surface so it is better to get those much-needed ranking points in a Challenger.
For Lojda, I think Wimbledon remains a rather elusive dream.
Oh, I wasn't being critical. It's just different mentalities. Some guys have different priorities. Guys like Zeballos and Ramos are right on the verge of the top 100. So, instead of going to Wimbledon, they play a challenger. If they win it, they are top 100, and situation themselves to make the USO, and play ATP events. Other guys will play a GS qualifying event with little chance to succeed, but as you said, they want to fulfill their dreams. It is what it is, both are perfectly valid positions.