Oh, I mamesh have no patience for this. The OP made a very presumptuous statement about ruchniyus. I know Kollel people who are not particularly ruchaNIYIM (an adjective, not “ruchniyus,” which is a noun). I know FREI people l’gamrei, who are extremely spiritual. Spirituality is not in the exclusive purview of “learning” people. It is a state of mind and being, and comes to each person in a different way. Based on the OPs question, one could ask why some Kollel people seem to want a certain gashmiyus-filled lifestyle that is inconsistent with the ruchniyus they supposedly possess. My statement and the original remark made by the OP are both faulty in their premise. As soon as one makes a generalization about a group, that is a questionable thing, as far as I am concerned.
SOME Kollel people are more spiritual than SOME working people. SOME working people are incredibly spiritual,more so than SOME Kollel people. Our hashkafos are personal, and what you see on the outside is not always what is contained in the inside. Al tistakeil bakankan…etc.