I don't think the dating/marriage analogy holds. If VCs are contacting you because your business is booming, you don't really need much of a relationship.
Now, talking to potential acquirers at any point in the lifecycle of the business is a great use of time, in my opinion. If you are open to the idea of eventually selling your company get close to the companies that might be interested in buying your company and stay close. Partnerships, shared customers, deep understanding of their technology and so forth
The other paradox is that you can't have a good execution plan without good leaders. The ones who can execute better do something like Rocket Internet, and don't become VCs. VCs are happy to pay someone to do all the work for them.
While there is a benefit to having relationships and them seeing you execute over time, it's easier to get a meeting if you have great numbers. How many VCs wouldn't take a meeting if your first sentence is, "We have a $150k in MRR and are growing at 20% month-over-month"? Any?
I don't know. Build your company.