As of this minute, there are 19 CZ452/455s of various flavors for sale, just on the first 2 pages of the Rimfire EE.
What's going on?
At this moment there are some 12 or 13 CZ rimfire bolt rifles on the first two pages of the Rimfire EE, including a 457, the newest model. There's also about 15 or 16 Savage rimfire bolt rifles, not all of them in .22LR. Given a reasonable price, both makes probably sell relatively quickly on the EE.
It may be true that there are more CZ-made bolt rifles on the EE at any time, most of the time. I'll offer a reason why.
CZ makes popular rifles because they are known for being well-made rifles. They also have a reputaion for being good shooters, and many of them are just that. Anyone looking at RFC, the biggest rimfire forum, can find frequent attestations of how great CZ rifles shoot, some of them seemingly rivalling very expensive alternatives. CZ bolt rimfires are also appealing because of their price. They are not nearly as expensive as many new German-made sporters and many CZ models are clos to or only a little more than Savage bolt rimfires.
Combine a reputation for quality and great shooting and a relatively reasonable price, and CZ popularity can be understood.
But do CZ's shoot as well as so often suggested? Probably not. Some do shoot very well, but most are average CZ shooters that meet the CZ standard of 2 MOA groups at 50 yards. (According to posters on RFC who've sent their CZ to CZ USA because it's not shooting well enough, CZ USA tells them if it meets 2 MOA it's not defective.) For comparison, 2 MOA is 1" at 50 yards. That's not nearly as good as many might prefer.
While the vast majority of CZ barrels are of average CZ quality, the fact is that an average CZ barrel is not up to competing well against many more expensive alternatives. A 2 MOA standard is probably reasonable for a mass production rifle, but it's not what many CZ buyers expect or want. To be sure some CZ's produce very good accuracy, but the average one doesn't. From my own experience with about ten of them, not all CZ rimfire rifles shoot equally well or very well.
Even CZ rifles that do shoot well don't shoot well with just any ammo. It's necessary to use good match ammo to get really good results. A lot of newer shooters especially may not be prepared for the expense of match ammo to achieve good accuracy.
In the end, if a CZ rimfire rifle is purchased for target shooting, it may be a little disappointing to many shooters. The result is that they do not keep them.
On the other hand, if a CZ is bought for hunting, plinking, and casual target shooting, shooters should be very satisfied with them. They are very well made and many of them shoot well enough to do as well or even better than many other rifles around the same cost.