At the moment, 4-letter .nets are best if they have clear use, such as an acronym, have premium letters or a good pattern (VCVC, CVCV, etc.) and other popular metrics. Otherwise, you may not gain immediate value on them.
However, if you'd take this as a bit of a gamble, you may find it to be a good investment down the road after letting it sit for a while.
Remember, a lot of people dissed supposedly 'meaningless' and really bad combination LLLL .com's a mere few months ago (literally), and now even what used to be considered the worst of them have big fans and have such an esteemed name ('anti-premium') so as to command a premium that would have been unthinkable when they were registered.