How do you figure? There are Z97 motherboards starting at 99$. You're getting fewer SATA6G ports and fewer USB ports, but when you're paying 60$ for a CPU what do you expect to pair it with. You're not going to pair it with an Asus 300$ Republic of Gamers monstrosity. If you buy a budget CPU , you're going to get a budget motherboard. And the fact of the matter is, there are high quality and lower cost Z97 motherboards. The higher the motherboard price gets you SLI, CF, more USB3, more SATA ports, SATA express, thunderbolt, and all that sort of thing. But if you want a budget motherboard, you can get a budget motherboard that will overclock just fine.
JJ from Asus mentioned this on the pcper podcast, but no matter what motherboard you buy, they will overclock equally well or reasonably close to each other. Silicon is the limiting factor, not the motherboard. In fact, Hasewll overclocking on the 140$ Z97-A is similar to that of the highest end Z97-deluxe motherboard which costs 400$. Exact same 4770k overclocks, he even mentioned this. This applies to all brands. If you get a Z97 motherboard that is 130$ or 250$ you get the same overclock or within 100mhz or so, silicon is the true limiting factor. You do not need an expensive motherboard, period.
What you are paying for with premium motherboards is either bling or more features. More ports. More thunderbolt. SLI. CF. That sort of thing. These are things that people buying a 60$ CPU do not need. So even if you need Z97 for pentium overclocking, I don't see the issue. There are 99$ Z97 motherboards from ASrock now that will do the job just fine. And there are many other similarly good budget motherboards from 99 to 130$ which will do the overclocking thing just fine. In fact, I see tons of Z97 motherboards in the 100-130$ range. It is not expensive. To me that doesn't seem incredibly unreasonable. Motherboards supporting overclocking always seem to be in the 100$+ range and like I said you don't need a 150 or 250$ motherboard to get what you want here.
Granted, it would be more ideal for there to be H91 type chipset motherboards that are a little cheaper. But there again you're paying less for even fewer features than the 100$ Z97 boards. I mean, while I don't see the 100$ Z97 boards as "expensive", I wouldn't disagree that an H91 board at 70$ would be even better. (H91 isn't out yet, i'm not sure if there will be an H91 actually). But it's just another situation of paying less to get even less. I don't know.