This would only mean that the forum was meant for signature campaign which is absolutely wrong

Besides its illegal for an individual to enter a bounty with multiple account if caught would be penalized so that case is solved.

And if you check it the real bounties that pays in bitcoin accepts only high ranking members so there is a benefit to rise in your rank

And besides some individuals would focus on first getting the merits then after they must have gotten merit required to rise to there desired rank then then fall back to spamming just to match there activities to the rank.