DA 37 is entry-level editorial territory, and the right place to test whether guest content earns you anything before you spend premium money.
Generalist inventory also varies more than any other kind, which is why the numbers in this brief matter more than the label. A 37 DA domain with 14.8k estimated monthly visits and Do-follow links is a different product from the same DA with a tenth of the traffic, and they are priced too close together in most catalogues.
Within the General section of the index — 1,576 listings, 39 median DA, 5k median traffic, $70 median price — this placement is 7% above the median on cost and about 2.7× the index median on audience. Listings in that section range from $30 at the cheap end, so the question is not whether $75 is high for a link, but whether it is high for this one.
Where ifispc.org is not a topical match for your market, buy it for that plausibility and for whatever brand exposure comes free, and put your exact-match anchors on the sites that genuinely cover your subject. That one discipline is the difference between a general guest post strengthening a profile and the same link making it look synthetic.
Our observation on this host is do-follow outbound links in editorial content. That is the attribute, not the value: the 37 DA and 14.8k monthly visits are what the attribute is attached to.