My opinion here. I believe that the game would have been very different without SUP, if we assume that there wasn't another team spending the equivalent. Don't get me wrong, I know that you have also communicated your grievances to Gree in the past, especially during certain periods when the game was being exploited.
Without SUP I believe that the game would either gone under, or more likely it would be less confusing and certainly less buggy. Gree will always consider aspects of the game a success based on profitability. Doesn't matter how much anger there is in the community, if the profits remain high.
For example, the first 7 day WD created much hate on the forum. Even the Devs were unaware to the negative feedback. Numerous factions did less during this event, but SUP continued to spend and this gave the impression that although people protested, the event itself still made more money... So of course they brought it back again..
If SUP only spent on features that deserved it, Gree would probably respond and start to focus on these aspects, but a long as a majority of you continue to tap on everything, the game while continue in its current trend.
(typed on mobile.. Sorry about typos)