Thing is though, a deck that wins most of the time still has a better chance of being high rank than a creative deck that wins some of the time. Sounds to me like a thumbs up deserves 3x everything.
I disagree with the "everything". Electrum does not decrease on a loss, so a creative deck only needs to get a single extra thumbs up for each extra loss to make the same profit over the same timespan. This is a perfectly reasonable ratio, so the only reason creative decks are unprofitable is that they get eliminated too quickly. This a problem with the rating.
Secondly, the ratings are more of high high level issue. I looked through the leagues just now and compiled a list of the rating values for a win and a loss (WARNING: Real values are subject to continuous change, table values will remain constant):
League | Win | Loss | TU/Loss |
Bronze | 10 | -10 | 2 |
Silver | 13 | -20 | 2.54 |
Gold | 11 | -30 | 3.73 |
Platinum | 6 | -40 | 7.67 |
The final column lists how many extra thumbs up a deck currently needs for each extra loss it receives, in order to have the same rating. We can see that Plat has over double the ratio gold has, and things get better the lower the league you are in. In lower leagues sacrificing win-rate for creativity is already viable. In gold, I don't have enough data to tell. In platinum, it will get you kicked out quickly. So any increase in the rating boost from thumbs up should scale with what league it is in.
EDIT: Actually, are we sure that creative decks are not viable in plat? The extra points for health&stuff along with all the low win-rate farmers result in high win-rates regardless, with the OP as an example, so assuming the plat farmers are not jerkier than in lower leagues, an increase in creativity should result in more thumbs up than it would in lower leagues. Glancing through the current top 50, several of them appear to have a pretty decent percentage (30%+) of thumbs ups. Of course, these decks are old enough that the flux in rating/win will make my guess at the TU rate inaccurate, but things are looking less clear. Bad decks are clearly not viable regardless of thumbs ups, but a deck that is strong and creative might be able to compete with decks that are really strong and overused.