I guess they are trying to automate it as much as possible to...

I guess they are trying to automate it as much as possible to reduce the admin burden.
I personally can't see the problem of allowing people to use the Corporate Action screen for all SPP & if you don't, use the automatic route.

I got message confirmations of $0 for MVP, $30K for UWL & $10K for ADI. That uses up all my PP so it'll be interesting to see what they do tomorrow with MVP.

When I questioned an allocation on my firsr SPP as to why it was a certain amount the reply was 'that's what you chose', so IB think the customers are choosing the amounts not OnMarket it would seem.

Anyway any of the SPP could plummet on a market slump or soar on a takeover so it's always going to be a bit of a crap shoot.

By the way I noticed today that AQR did an SPP last year as well, the pricing was a 13% discount & SPP Harvester got allocated $3.
It's on the blog
https://www.onmarket.com.au/about-us/blog/spp-harvester-upcoming-past-spps/