Because a character who doesn't immediately endear themselves to us is worthless right off the bat.
Come on. It's been 1 episode. Give the guy a chance to grow, develop, and change.

I'm willing to, but right now he reminds me a lot of Gai Ikari from Gokaiger in personality and "four-year-old-who-dresses-himself" fashion sense. I'd love to be wrong, but I hated that fanboy manchild character on Gokaiger and am not thrilled with seeing another one here.

I understand.
But I think Gai's fault was that he was already a ranger before his actual appearance. I want Shunpei's to grow and mature over the series to culminate in him becoming a full fledged wizard, and this, a Rider.

Like in Blade, before all that Mutsuki business, when they had the Leangle Belt and Ace in hand, Kotaro briefly aspired to become a Rider to protect his sister and Amane. Part of me really wanted him to become Leangle, however brief. Those same feelings are now moving over to Shunpei.

Yeah. If you ignore the existence of the Blue Dolphin slip for the Twin Brace, the V-Changer Compact, Ptera Ranger's Dino Buckler coin, Ninja White's Doron Changer coin, the pink light on the Accelchanger, the pink button on the Gingabrace, Gao White's tiger attachment for the G Phone, Hurricane Blue's disk for the Hurricane Gyro, Abare Yellow's plate for the Dino Buckler, Magi Pink and Blue's cut outs for the Magiphone, the pink and yellow buttons on the Shodophone, the Gosei cards for Gosei Pink and Yellow(not to mention all the Dice-O cards for female senshi), and EVERY FEMALE SENSHI IN THE FORM OF A RANGER KEY, then we never get toys that change Japanese boys into girl characters! Oh wait. We still do, since those are just in Sentai... >_<

I know Kamen Rider is supposedly more popular than Super Sentai, but if this business model was so atrociously non-lucrative, then I think Toei/Bandai would've done a 360, oh I don't know... almost 25 years ago?

Aren't almost all of those part of a set, not individually sold and bought? If that's the case, then it doesn't exactly qualify, since a kid would be physically unable to buy the morpher without the female character's item.

At this point I'm just waiting for Haruto to fuse with the Dragon/Bike & form "Guymelef Stage."

That doesn't change the fact that Bandai has been putting money, as minimal as it may be, into enabling their transformation devices to represent the transformations of the female senshi.

...I've watched episodes of Ryuki, W, and Fourze, and they didn't manage to pull me in, but after watching the first two episodes of Wizard I think this'll be the show that finally pulls me into Kamen Rider. There's just something I like about this show that wasn't there for me in the other ones I watched. Maybe it's the designs, maybe it's the characters, I just can't put my finger on it. In any case, Haruto is much less... enthusiastic than Gentaro, and I love it. Gentaro's constant "I WILL BECOME FRIENDS WITH EVERYBODY!" thing got a bit overbearing.

Except that it's bundled with everyone else's morpher as well.
We're talking about a solo release belt, used to solely transform the female character. Not swappable plates.
It would be a different story if the there was a DinoBuckle that only came with the Pterodactyl coin, or a Magiphone that was solely for Pink or Blue.

Well... Single release female senshi ranger keys...
...My argument is practically shattering... ;_;