I haven't done the math because it seems so miniscule... and there are risks per se, in that you can lose DEC in price fluctuations, but since that loss in DEC is a gain in Hive I consider it a win either way, taking the upcoming 3Spk token drop into account. Then there's just price movement in general, of course...

Having said that, I'm happy to report that the liquidity pools are an amazing place to swap. Any time I'm presented with a fee that can be altered I can usually get it to go through for 0.1%.

So far that's proving true on smaller transactions (around $200 or less) for DEC, SPS, Hive, and LTC swaps, so the cost of swapping stuff around to get it into the pools is more or less negligible, and I don't think there is a fee for adding liquidity.

Regarding a guide to add liquidity, I don't know of one but it's all pretty straight forward.

Go to tribaldex.com
pools/add liquidity and choose the hive:dec pool in the dropdown window, choose the amounts of each to add and submit it.

You need equal amounts of each token you're adding but I always use the first MAX button and if that doesn't work I use the next one and it does... :)

Did I answer your questions? Anything I missed?