Earlier quoted context omitted.
Notice that it also says "≤ 4 Business Day Turnaround Time" , so technically $1750 buys you 7.5 projects every month. Whether they can actually deliver finished designs every 4 days is a different question.
My experience with designers is that it takes a lot of revisions to get stuff right. A single project will have dozens of emails back and forth. If a response really takes 4 working days, that doesn’t sound very useful — unless you aren’t picky and will accept whatever the designer sends you (which in my experience usually isn’t even close to the quality of the work in their portfolio)
We're averaging about 3 projects/mo per client based on the first batch of customers who've been using the service for the last 4 months or so. Having a dedicated design team (not outsourced but in house) makes it easier for the client. They know what to expect. The workflow gets improved etc. the way we can make it work is because of the subscription model. It allows us to spend less time looking for projects (time = money). And more time doing what we love (designing interfaces and brands)