@drdax Hey, i have been valuing companies in latam for 8 years so i know a lot of how institutional investors think. What i learn from investors is that they could be very bullish about your business so it should be a nice exiting point (cash out). and if they pay you this 6x ebitda they think they will earn more. However do you think that your business could increase revenue o widen margins? If you feel investors are more bullish than you, ask them more money, they will increase the offer and you leave.
If you think that your business is still small, you can keep it growing and decline the offer, investors will try to pay even more, but you still dont have a "price".
Finally, i think that the most important thing is emotionally, do you want to leave working in that space? what would you do with such amount of money? what makes you feel better your own company (growing) or a nice bank account?
Hope you the best for you!