I'll restate something I calculated in November last year... Note: these stats were calculated as at 300 marathons, I'm now at 370ish.
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I've not been logging my Daily Marathon rewards, however, based on GT7 'My Page' and 'Milestones', I've logged in on 451 days, and completed the daily marathon 300 times.
Using the probabilities published at 1.27 for the ticket rewards on GT7info, and only looking at the 277 marathons completed whilst at Collector level 20 or higher (in other words ignoring most of the rewards for the first month), I've most likely accrued the following from the DM rewards...
12,749,000 Cr.
20 cars worth between 30,000 & 100,000 Cr.
10 cars worth between 120,000 & 450,000 Cr.
3 cars worth between 500,000 & 3,450,000 Cr.
25 standard tuning parts
17 'S' Parts
6 Engines
17 Invites.
... all as a reward for playing, which I was doing anyway. As someone that wants at least 2 of each (edit: Modifiable) car in the game the savings on car purchases were potentially >16m Cr., and as far as I can tell the most expensive car I won was the RB X2014 worth 3m Cr.
10,000 Cr. or less tickets would have come up 187 times from 300.
Notionally, on the 151 days I logged in, but didn't complete the daily marathon (most likely days when I was working on liveries only), the Cr. only total would be 20,448,000, and with 53 cars won a potential saving of 28m Cr.
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Anybody that think this giveaway is designed to drive people towards MTX's rather than driving regular engagement needs to get their head checked.