Why even try..
Hasn't it been shown, several times, that interest in web based AJAX applications for mobile devices is minimal at best? People want native applications that can squeeze in every drop of creativity.
Only in deluded minds of networks would they think it would be possible to create a market for this, and even then managed to make a mess out of it with all these versions no one cares about.
Also if premium text numbers are any indication, the commissions charged on those in-application billings will make the 30% Apple and Google charges seem like a fantastic deal...