The Valentines Crate is, on paper, a scam. However, this is based almost entirely on my own estimates of how much the unique stuff in the crate is worth, which you will likely have a different opinion on than I do.
I evaluated the crate based on its full retail price of US$4, as the -15% sale doesn't affect its standing relative to the other crates.
On average, it returns 27.65% of your money in vouchers. You get about 1.5m in in-game stuff and US$0.47 in IRL value (Invaded ranks, cosmetics) per effective dollar spent. This comes with the caveat that a lot of that value, especially IRL value, is an untested estimate of the value of unique items. You may disagree with me and think the items are better or worse than I evaluate them as. Its poor returns stem mostly from the very low amount of keys it rewards (2.245 rolls/purchased key). Most other crates return 2.5-4.5 rolls/purchased key.
If you evaluate it at the sale price, it looks a little better, at 32.53% - 1.9m/USD - $0.60 IRL/USD. All crates, not just this one, improve like that because of a sale, obviously.
Personally, I would rather buy the Love crate.
Full analysis:

I evaluated the crate based on its full retail price of US$4, as the -15% sale doesn't affect its standing relative to the other crates.
On average, it returns 27.65% of your money in vouchers. You get about 1.5m in in-game stuff and US$0.47 in IRL value (Invaded ranks, cosmetics) per effective dollar spent. This comes with the caveat that a lot of that value, especially IRL value, is an untested estimate of the value of unique items. You may disagree with me and think the items are better or worse than I evaluate them as. Its poor returns stem mostly from the very low amount of keys it rewards (2.245 rolls/purchased key). Most other crates return 2.5-4.5 rolls/purchased key.
If you evaluate it at the sale price, it looks a little better, at 32.53% - 1.9m/USD - $0.60 IRL/USD. All crates, not just this one, improve like that because of a sale, obviously.
Personally, I would rather buy the Love crate.
Full analysis:
