Which runs were 300-400?
AFAIK the most recent super-popular runs were:
USN Endura 4: 600 pieces in two runs of 300 a few weeks apart sold through the Spyderco website.
Forum Native: 600 pieces at once sold through the Spyderco website.
Blue Manix 2: 500 pieces sold through dealers.
It appears that if you are not on a pre-order list 6 months to a year in advance you risk missing out, now forced to pay 2-3x the price on ebay.
That's not even close to reality, if we don't look at the facts it makes no sense for us to speculate on complex topics. Pre-ordering is actually a new phenomenon in this Spydie community and I recall no instances of either 1 year of 6 month pre-orders for anything other than the M4 Military which is exclusive to one dealer. Most pre-order lists are a few months at the most. Dealers don't want the risk associated with any longer waits for a production piece. Second, it is
very rare that a sprint will sell for 2-3X the street price. The forum Native did it a few times but other than that most barely reach the 1.5X mark. I've yet to see a Blue Manix sell for $260-$390. That Sprint has just barely reached the 1.5X mark but appears to be coming down slightly. And finally, no one is forced to buy any knife. When buying on eBay you set your own price, if it's too high, don't buy it.
I'm reminded of last year's J.D. Smith Sprint. It had mediocre popularity and is still found in stock at quite a few dealers. I believe it had a run of 1200 pieces, and was essentially a failure as far as drawing in collectors and becoming a popular model. It's a good example of how Sprint runs are not a guaranteed success and don't always sell like they're expected.
Now, without knowing the costs or business aspects of the Sprint concept none of us can positively say if the run size should be increased. But I think that if the runs get too large they lose their attraction to both collectors and dealers. Collectors don't want a knife that is common and easily found and dealers don't want to stock another SKU that isn't going to move.
Sprints appear to be a very fine line which takes a lot of knowledge of the industry and the community. To call for increasing them without taking into consideration a lot of factors is not something I would feel comfortable doing. I've placed my trust in the company as far as making a good, safe product and I'll continue to trust in their business sense as well.