Sinsolena, you're totaly wrong and what u say is out of reality.
so i'll answer each of points you speak of.
-you impatiently summon outside of a summon event.
Absolutly not, i never do that i wait like most peaple that have a brain, i even use gem to take x11 blue shards not for anything else.
but as all know, it's not enough, you need gold shards and at least 2 (or 3 if u don't have purple ones) to go to the end or near it if you have a lot of blue shards (don't even talk about the green ones dude, seriously, stop)
-if you upgrade chars to 60 outside of the leveling event.
ho yea i have done it once soooo sorry but hey! i'm talking about at least 6 heroes at 6 stars not just one (and sorry if i exaggerated, it's more like 3 heroes 6 stars and somes oters stars), so even if i upgraded one heroe normaly i have at least the time to up necessary others to go to 2 heroes 6 stars and you can't because of others events where you need to collect artefact and stop lvling heroes, same as spend energy to do labyrinth but maybe you don't do it....
-if you upgrade your Artifacts outside of the silver-dump-event.
to finish this event you need at least 5 milions and you're a lucky man, VERY lucky.(don't remember but i spend more than 5 milions to finish it)
And if you use the little trick to up 5 stars epic artefact to 12 max and never upgrade to 16 that is not good haha...so when i up to 16 ???
The problem comes to do money, but yes if you have all the heroes u need, all the artefect you need, then you can sell evrything you drop, so here i think it may be possible.
but most of the time you sell half or 2/3 of what you collect and you don't gain a lot of gold in dungeon, only if u sell all the artefacts.
In campaign you have a little less gain and selling of course everything because it's crap.
-you don't use the "collect artifacts" event to level food to prepare for the next levelign event.
Let me explain you how it work because it seem we don't play the same game, on the "collect artefact" event to go to the end or near, you need to do the dungeons because they give you at least a 4 star in a blue or more, that give you much more reward than a wite or green one you have in the campaign and with min 3 stars, the reward is simple, it's twice more for 2 more energy/run....
now exp in dungeons??? hoooo nearly nothing, u can't use dungeons to up heroes, well you can but ....it's not enough.
And this is exactly what they want, choose: exp/artefact ? hehehe choose you can't do both !
so in the end when you try to do all of it, you can't finish all events or you need to focus for the one you really want to finish and trash others.
ho i don't count the one you need somes gold shards, because you juste have one every month...
or money spender, in the end, too big man....
Maybe you think they will give you money if you cover them up, i don't know but it was not smart....
edit: and the pvp event, u din't talk about it?
Yea, the one with even if your's smart enough to take the reward of the day before the event to have more try and then do a perfect score in gold 4 star you can't finish it without a lot of gems?