At 40 DA, judge the placement on the page and the neighbours, not on the score.
General-interest publications are the workhorses of a link profile and the easiest place to overpay. The article shape that works is boringly specific: a problem, the method used, what happened, what it cost. A general title with 2.5k monthly visits survives because it answers questions well, not because it loves contributors, so a piece with nothing verifiable in it gets edited down to a bio link.
Within the General section of the index — 1,576 listings, 39 median DA, 5k median traffic, $70 median price — this placement is within a few percent of the median on cost and roughly 45% of the index median on audience. Listings in that section range from $30 at the cheap end, so the question is not whether $70 is high for a link, but whether it is high for this one.
Where rankmagzine.com 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 40 DA and 2.5k monthly visits are what the attribute is attached to.