It seems out generic timeline for Microsoft 0days goes along the lines of:

• Flaw is found.
• Microsoft says it isn't being widely exploited and "safe browsing habits" will save you¹.
• The threat grows in the wild on porn and pirate sites.
• Microsoft re-iterates the minimal exploitation.
• The threat continues to grow on 'safe' sites.

The point here is that a threat is going to continue to grow as long as there isn't effective mitigation, like a patch. When Microsoft says there is only minimal exploitation is exactly the time they should be rushing out a fix. Even if the threat is growing slowly, this is not an indication by itself that it won't be used in an attack on a multiple site advertiser or the like. This isn't even taking into account all the fun you can have with a targeted attack; we are still dealing with preventing mass exploitation.

As an aside: IE 0day "in the wild" threat growth:

• Near 100 sites
• Over 100 sites
• Over 200 sites