@UpperMountain
Sorry about the late reply 
>Renars, to get started I’d pay the $50/month rate?
That depends on the number of Products you will be updating. if it’s over 5000 Products but below 50 000 then yes, you would need to take Big subscription (50 USD). If the Product count is under 5000 then you can take the Basic plan (20 USD).
Of course, you are free to cancel the app subscription by uninstalling the app or switching to the Demo plan when you are finished.
>How long will 12-13K photo deletions take?
That is really really hard to estimate as it depends on way too many factors, for example, app subscription plan, store API Call limit, product count, how many images per product, Shopify API response time, etc. etc.
>Can your app also take MPN’s from my master spreadsheet and put them into my Google shopping feed in Shopify?
To answer this, we would need to understand more details on what exactly needs to be achieved. I would then suggest reaching out to Matrixify (Excelify) support directly.
>Like so?
Yes! The data looks good, as simple as that 
@KieranR
>Yeah Matrixify is awesome, pretty much a must-have on all the stores I work on. It’s really a shame that it’s essentially plugging basic holes in missing Shopify functionality. Shopify has a feature gaps all over the place with CRUD / bulk / export / import that should be part of the platform admin UI imo.
Amazing to hear that you have been enjoying the app and using it on most stores.
Indeed a lot of functionality that we offer normally should be a part of Shopify native import/export features. But as over time Shopify also improves their import/export features, then we also have a great motivation to develop more and more features that app users are requesting.