This thread became interesting to me because I recently decluttered my books. I decided to declutter my pens and inks as well.
Picking out pens was easy, and I decided to give them away at work. I realized they should be accompanied by ink. So, I picked out 13 bottles of ink to go with the 15 pens (2 of the pens can take cartridges). But, I did a bad thing: I added up the cost of the bottles. I realized I was into several hundred dollars. (The Edelstein and Iroshizuku bottles helped me get there quickly, but even the Noodler's bottles add up.)
So, now I'm going to compromise. I'm going to do my correcting (I'm a teacher), list making, and random note-taking with a 1.5mm nib with the inks I wanted to get rid of. The nib forces me to watch my handwriting and uses up the ink quickly. I'm also going to eyedropper fill some Platinum Preppies to leave at school. It will take longer, but I will edit the inks through usage.
The pens are a bit different. I may save some of my sample vials from Goulet Pens' Inkdrop and give those away with the pens. Of course, even the pens add up quickly. One is a TWSBI Vac 700. That adds dollars fast. There are also Noodler's Nib Creapers, one or two Konrads, an old Cross, an old Parker, two Chinese pens, a TWSBI 540, and a Lamy ABC.
I want to reduce it all down because I want my inks and pens to be like my house. The house is only 675 square feet, so I use every room every day. I want to be able to use my pens and inks regularly. I don't mind them taking turns, but I realized I have too many of everything. Time to go.