>>132787290You're putting more thought into this than Toriyama did. The simple explanation is the one that often works, considering his habits.
Toriyama wrote in Bulma finding Goku attractive but also brought back Chi-chi for one reason: to pair him off with someone and eventually give Goku a son. Chi-chi was the easiest to work with, and Bulma was a fallback in case that didn't work out. Chi-chi had a crush on Goku when she was a kid, good. Bulma finds grown up Goku attractive, coincidentally right at the same time Chi-chi gets reintroduced. Toriyama didn't care about romantic chemistry, hell, the anime gave more thought about that than Toriyama ever did (though as /tg/ kept reminding me Toei kept trying to pair Goku with redheads for some reason). Chi-chi won the monkeybowl because it was the easiest for him to work with, WITHOUT having to put extra work or thought into it. She gets to pop him out a son, be a concerned/obsessive mom, can get a few laughs over her overprotectiveness, and Toriyama can continue with what series escalation he'd managed to plan ahead for, for once.
