For gaining pearls we already have a building, called blacksmith. The idea is to unlock all slots to be able to convert items into a lot of pearls. If you didn’t unlock all blacksmith slots, then make it a goal to do so. If believe that’s the reason why you are asking for such a building, the lack of pearls. With all slots unlocked and luck gear, you will be able to get a lot of pearls on a daily basis. So idea 1 and 2 are not needed, blacksmith provides the pearls you need. You need to invest in him not for nothing. Like me a lot of players did (it’s quite expensive in terms of gems) and once you did, you benefit from that moment on.
We already get a free ticket every 4 weeks. Only thing you need to do is to collect it as soon as it is available. A pro ticket costs 750 gems, you can reduce the price per ticket to 560 gems by buying a five pack, so save 2800 gems when you intent to play the pro league. By playing it every time, you can win a lot of gems by ending high on the list. Paying customers get a lot of extras, pro rewards, pro tickets, pearls, pal food and so on. So as free player you can’t have it all. I would suggest first to invest in unlocking all blacksmith slots and improving daily donation by upgrading alliance tower. When that’s accomplished, you can focus on the pro tickets. To speed up the process somewhat, you can do a little investment by buying the daily gem chest for a very low price per month, this would already be sufficient to provide you 1700-1800 gems on a monthly basis.
Option 4, I don’t like this idea, it’s a competition costing even more time from players. We aren’t married to the game and flare is no charity company. This would reduce their income. Players would need to buy less gems, pal chests and so on. Tickets can already be given to alliance members.
Option 5, also discussed a lot of times. Flare already responded that this won’t be implemented. I am not going to repeat the reason why. You can search for those topics by searching all content and enter search term “Market”.