Well Because I think the exchange price is way too much plus they made it only a stupid chance item in that reinforcement pack, I would really like this ship for doffing and RRing, but I bought 10 Reinforcement pac and no freighter, So I would be greateful to anyone willing to sell me one for the 7 million, I'll probably have more then that soon, Energy credits i have.
I'm not sure what RRing is (maybe someone will help me out here) but for DOFFing I use the Excelsior Retrofit more than my Tuffli. Being able to transwarp to most of the exploration areas (Arucanis arm being mysteriously not on the transwarp list for some reason) is great for colonial and trade but meh for most everything else. The excelsior and a purple astrometrics DOFF gets you better coverage. The most used features on my Tuffli are the ship selector, bank/exchange and the crafting station. I should probably make better use of the commodities vendor who seems to sell all the commodities at roughly half the cost of the replicator but i'm too lazy to pop inside the ship everytime that comes up.