TBH, I don't think PD ever expected anyone to go for the mult-million dollar cars as soon as possible. Just seems like a ridiculously unrealistic goal to hit right out the gate.
Probably not. The game has only been out for 2 weeks and it seems like they want all of the toys at the start. Part of what makes these things special is that they're hard to get - and will probably continue to be until we get whatever planned DLC Polyphony might have in store.
On one hand, credit payouts in GTS felt like a bit too much (with too many car duplicates from the Daily Workout) and not enough to spend credits on. Excellent for Sport Mode, but at a point everything felt pointless. Why drive anything other than the meta or quirkiest/rarest cars? How do you improve beyond that point? What's the point of any of these cars if you just end up driving your favorites? Ironically, GTA has this same problem.
On the other hand , GT6 would be extremely grindy without seasonal events or the Sierra/Moon/Goodwood/Red Bull DLCs. You could still spend hundreds of thousands of credits purely on parts and tires to be competitive. Arguably, this game gave you less and still offered MTX for Credits.
The car prices were even higher. For perspective, v1.00 GT6 gave us the R18 Tdi '11 for 5m Cr, as opposed to now's 3m Cr(GT7). It eventually got dropped to 2m Cr(GT6) after updates, where we had even better methods to grind. Add the 200% login bonus and nobody really complained.
From the perspective of v1.00 GT6, this game is throwing you a bone often. Post-DLC we got spoiled comparatively.
From the perspective of GTS, everything looks like a tedious grind because pretty much everything was already given to you.