I find that calling it equipment "porn" is actually quite accurate. I know I get excited when I look at all those weapons, armors, vehicles, drones, 'wares, accessories and modification and think about what options I'm going to take and how fun those toys are going to be once I get my hands on them, and I don't think I'm the only one who feels that way. Granted, it's not a sexual sort of excitement (Class 4 I-Dolls with "certain modifications" notwithstanding), but I've written lists of all the toys I want and all the modifications and accessories I'm going to put on them, as well as a 1.2 million nuyen betaware upgrade. I've looked at those lists weeks, or even months, after they were written in moments of boredom, thinking about how awesome it's going to be when I finally got them. Now that I have managed to get my hands on some of those goodies, I've been thinking about how awesome they're going to be when I use them next session (or more accurately for everything except the new assault rifle, whenever they're relevant; I've had my car for a while and haven't used for anything other than basic transportation, leaving me disappointed that we haven't had a chase scene yet). Trust me, there is an analogy to masturbation to be made. More specifically the analogy involves nudes from a girlfriend, because once you've got the nuyen you can actually get what you've been wanting.
Woo, that got a little weird there.
Anyways, you need a LOT of different options because people want to do different things and do them different ways. Some guys think a helicopter should be a relatively stealthy observation and extraction vehicle; others, like me, want assault helicopters and assault helicopters with transport capability. Plus you need some aesthetic variety as well. I didn't like the sound of the Hyundai Shin-Hyung, but fell into love with the GMC Phoenix despite them being mostly the same statwise.