Agreed most of the time but not 'always'. I have many times in the past auditioned higher priced products at home only to either reject the way they sounded
in my room, or felt that the cost did not justfy the percentage of upgrade. This is the only reason I am not automatically pulling the trigger on the ImagineT's 'before' listening to the Image series if possible. The Imagines were wonderful sounding speakers and certainly worthy of an up grade over my 4T's. But, for me, that's not the whole story.
For me, I've found that over the years of experimentation with various systems in different listening room environments / and numerous gear (at all price points) that the single most influencial factor on ANY system is the relationship between the speakers AND the room itself. I feel nothing more in the chain of upgrading can have a bigger and more (cost effective) reward. I've listened to many systems that when properly set up, can take a relatively 'inexpensive' speaker such as the 4t / T45, along with some good equipment in front of them and absolutely embarrass a 100k system in a poor environment. I also understand that the majority of audio enthusiast don't always have the luxury of being able to set up a dedicated listening environment .... geeee ..... things like having extra 'unused' space / kids /WAF ... have a tendency to trump one's hobby hopes and push it down the priorty chain
Now that i'm heading down the back slope of 'prime' and having no kids around and a very understanding wife, I do have a small dedicated listening room that enables no restraints on equipment placement and room treatment. By having that to work with i've been able to extract very impressive performance out of my 4t's. So much so that as good as the Imagines were, it left me wondering whether they were in fact worth the 2k upgrade. Better? ..... yes. But .... ?
Now I certainly don't have deep enough pockets for the 'sky's the limit' kind of equipment, but I can comfortably make changes to my system with what most would call 'sane' levels of equipment, so that's not the issue with the Imagines, I have always been the kind of guy that enjoys setting up a great performing system based on percentage of gain vrs. dollar spent. Maybe that's against most normal philosophy, but it's kind of a fun, rewarding challenge. Plus ..... it allows me to be able to keep 'playing' around with different gear
more frequently
So, this all comes back to my original remark that if I can obtain 80% of the performance out of a product (albeit speakers / amps or anything else in the chain) at half the cost (in the case of the Images) the challenge becons me, lol...... that's just me. That's just my logic and i'm certainly not trying to project that on anyone. That's what makes this hobby fun ..... everybody perceives and attacks it differently.

Besides, it's a win - win , if the Images don't pan out then I will buy the ImagineT's. I'm in no hurry.
Good listening & enjoy your T45's 3db ..... they can be truly remarkable speakers!