Purchases are measured by value, not quantity. What is the point of stating a number in advance? They have no idea what startups will be doing next year. A single good acquisition could transform them. A careless gathering of 15 useless companies would call into question the intelligence of the management, and affect their IPO. Money can be spent on a lot of other things, too. Nothing is clear yet. A non-story until they actually acquire something next year.