Glad to help!
that was interesting
Nice, thanks 
One year has approximatly 52 weeks and if each rewards with 4 bonus soul gems in the end you end up with 208 soul gems. Do you think it's worth it? If it was giving you 40 % bonus soul gem for the last day of the week which normally grants you 20 points I might be considering but for now it's nothing special in my opinion.
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
So, now you are able to buy runes on the shop. The mannaz rune is an orange colored rune which gives you a bonus of 40% soul gems for 7 days - Means it give you 7 soul gems a day instead of 5. You can buy it for 10 soul gems on shop and it gives you a weekly profit of 39 soul gems (taking off the rune cost), when regulary you will earn 35. Free 4 soul gems a week. It's a small amount but the effort is low and in long term this might help you - so I thought I should put it here. Have a nice weekend!