I think the OP should back up a step here. The question really shouldn't be why we don't get a big time receiver so much as it should be what is the value of a big time receiver? Considering 5 of the top 10 receivers this season (including the top 4) are on teams without winning records, what exactly is the value of a big-time receiver when it comes to winning football games?
Calvin Johnson has had 1 winning season so far in 7 seasons. Larry Fitzgerald has been on 3 winning teams (including this year) out of 10 seasons. Andre Johnson has been on 3 winning teams out of 11 seasons.
Dez Bryant has yet to play for a winning team, and when he performs well, his team loses (4-12 in games he gains over 100 yards or scores 2 TDs). Josh Gordon just completed perhaps the greatest 4-game stretch for a wide receiver ever (36 catches for 774 yards, 21.5 YPC and 5 TDs, plus a 34-yard run) yet Cleveland lost all 4 games. In fact, Cleveland is 1-6 in games where Gordon gets 100 yards, and 3-2 in games he plays in but doesn't hit 100 yards.
There are also lots of good wide receivers on teams with winning records as well, don't get me wrong. But most of those guys don't come with massive contracts that destroy the team's cap. Here are the numbers for the other 5 receivers in the top 10 on winning teams:
5. DeSean Jackson: 5 years, $47M, $15M guaranteed
6. A.J. Green: rookie contract 4 years, $19.7M fully guaranteed
7. Alshon Jeffrey: rookie contract 4 years, $4.4M, $2.7 guaranteed
8. Demaryius Thomas: rookie contract 5 years, $12.2M, $9.4 guaranteed
9. Brandon Marshall: 5 years, $50M, $24M guaranteed
3 rookie deals for great value, 2 solid vets that are market value (in the top 20 deals based on average per year) but not at the very top like the top 5 below:
- Calvin Johnson: 7 years, $132M, $60M guaranteed
- Larry Fitzgerald: 8 years, $120M, $50M guaranteed
These next ones came during a DOWN year for contracts, yet teams still overspent and so far, haven't gotten great returns:
- Percy Harvin: 6 years, $67M, $25M guaranteed
- Mike Wallace: 5 years, $60M, $25M guaranteed
- Dwayne Bowe: 5 years, $56M, $26M guaranteed
This season, 4 of those 5 top contracts are contending for a potential play-off spot, but I don't know if any of them are really offering value. Fitzgerald leads the team in receptions but is second in yards. Harvin hasn't played much at all. Wallace is second on the team in receptions and yards to Brian Hartline, who also signed a 5-year deal for $31M, or basically half of what Wallace did. Dwayne Bowe isn't in the top 50 receivers in receptions or yards, and is second on the team in receptions to a running back.
In fact, if you look at the top 20 WR average salaries, only 9 are on winning teams (including Harvin, Wallace, and Bowe, who haven't really contributed near the levels thought when signed).
This is all just a long-winded way of saying that teams can win without big time receivers, especially if they don't have to carry the big-time contracts that often come with them. There just isn't a lot of value in spending $10M+ on a WR, and I don't know why the OP is so eager to see us do so. When you're trying to imitate the ******* Detroit Lions or Arizona Cardinals, well, I really don't know what to say...