It's kinda fun, personally. I like to play around with language and the grammar of a language.
I think Auxlangs (the ones made solely to facilatate communication) are fun, but I've yet to see one get enough speakers to be truely useful. Most get about 10,000 mostly from the same country. There's really no point to making a language that won't cross cultures. And they're really all Eurolangs -- so they're easy if you're a eurofag, but no chinese, korean, or iranian is going to recognize anything.
I've been looking at hanzi and kanji and that seems like the best approach. An international WRITTEN system. Something like having a set of symbols that everyone recognizes, and could be combined with other symbols to produce new words. You'd see a symbol for many trees and know it's a forest, or a symbol composed of "house" and "medicine" and know you're at a doctor's office. Even if you're reading the sign and mentally saying "doctor" in swahili, you'd recognize it in Japan, the US, Malasia, etc.