Ok, specifically the things you can use them for are as follows:
50 of each: go back to prep stage, letting you use items and connections for research
250 of each: Obtain a voluminous library if you don’t have one (Slightly cheaper: 750 total research, instead of 75 echoes in legal documents and 4 echoes in cryptic secrets)
500 of each: Reinstate university access
120 of one: Obtain collated research and copy of your work (Comes out to 2 pence per page, not worth it unless you want to collect the souvenir copies)
500 of one: Obtain 50 echoes in goods (in Storm Threnodies for Cryptopaleontological, Uncanny incunabla for Prelapsarian, and in extraordinary implications, incendiary gossip, and broken giant wine (Plus a second chance) for theosophistical)
500 Cryptopaleontological + all fate locked beasts and a hound of heaven: Bifurcated Owl.
Now, as you can see, 500 research gets you 5 echoes in goods. Also, 750 research gets you something where the biggest cost otherwise is 75 echoes in legal documents. I had some other evidence for my point but I can’t put my finger on it, basically it comes down to each research being worth 10 pence. Theosophistical research is technically slightly more valuable, as it is more difficult to obtain (Its major island, the grunting fens, requires TWO trips to reach).
By the way, this means the Ministry of Truth card on the seas is quite valuable, coming in at 1.5 echoes worth of goods (Comparable to a variety of PoSI cards).
Also, on paper using bats to deliver research isn’t worth it: You only get 4.5 echoes of research, for spending 4 echoes in bats. However, keep in mind your partner receives 15 of each research too, netting them 4.5 echoes of goods for only a single action. If you both share with each other, we take the profit from both to get 5 echoes, divide by the two action total, and wind up with a 2.50 echo per action net profit, making it VERY valuable indeed! This is even more valuable if you can get your bats through storylets, so their “cost” is based on their sell price, not their buy price (Making it two echoes in bats, 3.5 echo net profit). Though, the only decent way to do this is through the “temptations of power” option that grants salacious copy, as it’s a bonus 2 bats on top of your 12 copy. Not worth doing simply to get bats, but if you’re running the newspaper anyway it’s something to consider.
Remember kids, stay in school. Math is fucking magical.