I have dabbled in Marklin in the past. Kind of the Apple of HO Gauge - not compatible dimensionally with the HO (NRMA) standard nor electrically with DCC. Nice if you are doing European trains and I think are much more popular in Europe than in the US. They have a cache / name brand like Lionel from what I gather. Great quality / craftsmanship, especially in that scale. They aren't cheap and seem to hold their value fairly well as evidenced by "that auction site." There are a few solid dealers in the US.
You never know... might be someone on the forum who is interested. I'm pretty set and focusing back on O-gauge. I wish they would make some modern European trains in O-gauge, but that is a different topic.