Try living in Tokyo :p.
Forget 4th or 5th. I only have one fitear custom and am already having difficulty affording my 2nd meal.
Interesting, it seems I have been given misleading information.
In my years here at head-fi, I've discovered that in the majority of cases people have already made up their minds when seeking advice and are mainly looking for approval; it's also often the case I find that people have made up their minds before they even hear something as to whether they want it or not.
One can think of reasons to not buy customs---and the above mentioned points are all valid----but what it really comes down to is whether you want them or not (assuming you can afford / procure them)? If you genuinely want customs, I have a feeling no amount of logic is going to satisfy you for very long. Consider too that you're posting in what is essentially a forum filled with enablers (including myself).
I have a feeling too you'll always wonder "what if?"
That being said, I also think the desire itself is often more potent than the supposed object of that desire. Once you get customs you may very well be somewhat disappointed. It's happened to plenty of folks I know, and not because the customs aren't good. If you can find contentment with your TO GO! 334, then I'd suggest waiting a bit longer perhaps. You're still young (graduating high school), and FitEar isn't going anywhere. Plus Suyama-san is always coming out with interesting new products.
Also I have to agree that customs are going to be potentially problematic if you're still at a highly plastic age. But then that's logic, and this hobby ain't that logical.
This is because some people expect angels to come singing down from the heavens or getting inner ear massages after getting customs and realise that isn't the case. Also fit and comfort and even total isolation may not eventually be what some people expect or realise they want.
Because some people go in purchasing a CIEM expecting it to sound on par with TOTL headphones and blow away any universal iems.
The above posts make valid points. I'd also add a more general one however: when they desire something for so long and covet it, actually owning it can be anti-climactic for some people. This is true of any trophy. I think some people derive great satisfaction from desire itself, and desire once fulfilled is no more. Other times people look to objects to give them personal fulfillment in ways they simply cannot, as a sort of objet petit a.
I think everyone just saying if you dont try them you will never know if the sound is for you or not! But even when you do try and even find the one you like, unless you stop reading the threads or looking at other IEM/CIEM you may still not be totally happy as there is always another great sounding product out there (well....we all know newer/improved not necessarily the truth but hey.....we are only human). Or you read others reviews and they state a different IEM/CIEM has a different sound or they can hear different minute details and then you start thinking......I want to hear that!!
Basically, either be happy with what got. Try as much as possible to find the next purchase and quit then. Or buy, enjoy and research the next one!
(An expensive and never ending hobby)