I have a standard OD green Blur I use
An Elmax Blur I rotate for more casual occasions
A combo edged Blemish (discounted) Blur I use for work
I then have 2 more Elmax models (my favorite AND limited edition) and a half dozen others in different colors and steels in collecting. Easy to "collect" them because I have 3 in regular use, as well as a bunch of other cheaper chinese kershaws to use.
The conundrum is when I have the funds for "another" Blur, but I also see other knives I don't have, "yet", which I have to weigh the desires.
"collecting" is all at the whim of the collector though... If you want to collect Chinese made knives, more power to you. They likely won't ever have the resale value, (unless years from now they were highly favorable and discontinued).
Sprint runs and limited editions are usually labeled as such when they are released, keeping abreast of the news in the knife world via this site, Facebook pages from different knife sites, or via online "window shopping" at different retailers helps give you the jump on them when they are released, but it's all about keeping your eyes open and hoping to have the funds when they are released before they are sold out.
Keeping in mind, outside of a billion dollars of spendable money, you can't have them all, helps to keep you humble. No reason to fret over the ones you can't have, as there is always more that you can.
One thing, in conjunction with badhamner's comment, acquiring isn't a bad way to start either. Different styles, blade profiles, brands, and handle designs/materials, all helps to steer you in a right direction if/when you start purchasing higher end knives and collectors. For example, if you have an eye for traditionals patterned knives, before spending $50-100 or more a piece on expensive higher end brands, there is nothing wrong with spending $10-20 a piece on half decent Chinese made rough riders in multiple patterns first, to see in hand which pattern(s) you like the most...
Designers is another way to help gauge direction: If you like the Cryo design, you'll likely do well with other "Hinderer" designs when you decide to buy pricier models, since the Cryo was a design collaboration with Rick Hinderer.
If you love a CRKT Liong Mah Eraser, saving up for a real custom Mah Eraser might be worth your time, and easier knowing you like the design in hand thanks to the much cheaper production model.
Best advice, just buy knives you like and can afford, until you have enough variety to realize which ones you like more, and have enough quantity to patiently save up for nicer ones you want more...