Double or nothing
Those words make it sound like gambling but on HIVE the HELIOS token isn't exactly gambling. It actually has a defined use. Buying usernames and calling the 
Now images don't seem to be working for me at this moment but 1 HELIOS burnt on March 4th put 0.026 HBD in the posters wallet.. Now the reason I mention the date is because 1 HELIOS burnt gives a very different reward every single day. Sometimes more, sometimes less I'm still trying to figure out how the vote value works but that's the topic of a different post :)
However, HELIOS has a defined value if it is burnt so if you buy one for less than that amount and burn it you make money. Buy the token and burn it for LESS than you bought it for and you lose money. Simple.
Now if we know how much the vote is worth : 0.026HBD
And if we know the value of HIVE vs HBD : 0.064 HIVE/HBD
Then we can calculate the value of one HELIOS. 0.026HBD/0.064HBD/HIVE = 0.406 Hive
Pay less than 0.406 Hive per Helios and win
--> At least on March 4th, 2026. On other days? You will have to look at the math all over again :)
Why did I say double or nothing?
Look at this image from hive engine.
Notice the buy wall and the sell wall have drastically different prices. Note I've pointed to a sell of 0.406 and a buy of 0.164
If you buy at 0.406 the burn value equals the vote value
As a result you pay as much as you get.
Profit - Nothing
If you buy at 0.164?
Here the math makes sense. Hive is $0.064 and 0.164Hive/HELIOS.
Helios purchase price is : 0.0105 (in the above scenario)
If you get 0.026 HBD and only pay $0.0105 you effectively double your money
Doing the math
I say it over and over and over again. Do the math. But look above? If you are in a hurry to buy and take the best price for the moment? You make virtually no gain.
If you place a buy order on the low side and someone sells the HELIOS at that price you effectively double your money
Profit - Double
Take home message
Watch how much HELIOS upvotes are worth and do the math
The take home message is again: Do the math.
HELIOS is very useful and if you get it for the right price you can absolutely make money with it. However, doing the math and knowing what price to pay is incredibly important!
If there was a tight spread on the HIVE/HELIOS buy an sell on Hive Engine this would be a much easier choice. Look at the Buy/Sell, look at the HELIOS burn value and quickly evaluate. As there is a huge spread then it comes down to: How much should I pay, what the the likelihoods that I can buy at that price and then make a decision from there.
From here you can see that 
If you look at the recent orders? One person paid 0.38 to get HELIOS (not a great deal) and another only paid about 0.19 (a much better deal).
One broke even and the other will get double.