I must tell you, that for the normal cms hosting 30 items per collection are not enough.
For a good SEO you have create two fields for the “Meta-Title” and for the “Meta-Description” and also you have to create vor every image an extra field for the alt-text and therefore 30 fields are not enough.
In my current project I have a collection with 9 images. For every image I need an alt-text, so instead of 9 fields I need 18 fields only for the images, thats are over half of my collection fields. Plus the two fields for the meta-description and the meta-title, I must use 20 fields only for good SEO.
I would wish that the image field would include the alt-text directly, than I think 30 fields would be a deal, but even than something like 40 fields would be better.
At the price we pay, I think you can ask for a solution that does not force you to use all the fields for a good SEO, so you can not use them for the right content anymore.
Maybe you could change the image field, so that its like in the rich-text field, where you can easily add an alt-tag to the image without using an extra field.