I can't see the point of allowing shards, particularly since they are considered more than somewhat OP, in tournaments that are relatively accessible to everyone. If you want to "trial run" them, at least keep them out of unupped tournaments - upped tournaments are, by definition, more selective, and there is an argument to be had there that they could be given a try.
However, in my opinion, shards really shouldn't be allowed into tournaments and events (at all). Particularly with the new shards coming in, we lose a great amount of the metagame in favor of shards - that's not something I'd like to see. Since this will happen in EtG, I'd at least like tourneys and events to remain relatively secluded from what I consider to be this poison of the new shards. Despite what bucky seems to think, were new shards allowed in these events, the entire metagame would have to be based around them. Carrying sundials in a deck that normally wouldn't carry them just because of SoSa is a poor argument to claim that "SoSa sucks" - it's instead a great argument in favor of "SoSa is OP". I won't get into why I feel SoSa is OP here, but the point is there isn't any good reason to allow a card that will take up the entire metagame into these types of events.